The comedian, 42, who is known for her love tweakments like Botox and fillers, welcomed her daughter Hollandin October.
In December, Katherine teased that she’d had “serious cosmetic surgery” and even taken her newborn along with her.
However, she didn’t reveal what work she’d had done, until now.
Today the Canadian-born star spilled the beans and revealed that she’d undergone a full facelift in York, North Yorkshire.
Speaking on the latest edition of her Telling Everybody Everything podcast, Katherine said: “The surgery was a facelift. Yes, a full facelift – a little bit of fat transfer to my cheekbone area, and a small bleph[aroplasty].
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“A bleph is when they take a tiny bit of your eyelid skin, though not too much, and then they’ll usually – to avoid hollowness, put a little bit of fat back in there too.
“So I had some fat put in like my upper face, my eyelids, and then I had a facelift.’
Explaining why she wanted to have the cosmetic procedure, Katherine said: “Almost metaphorically I needed to do something, to reclaim my identity, to reclaim my autonomy, to claw back the face that I had in, like, 2019,’ she said.
“I am not crazy. I’m not trying to wind it back to 2006. I’m just trying to look the way I did, like, pre-COVID, pre-six pregnancies in five years.”
Talking about how she felt afterwards, The Duchess star said: “The beauty is you’re pretty numb afterwards.
“I was bruised, and I was swollen, and I think I am still a little bit swollen. But basically, I just went about my daily life from day one.
“They sent me home with some paracetamol. If I had needed stronger drugs, I think that was available, but I didn’t. I took ibuprofen, paracetamol for like three days.”
As she had the surgery in December, Katherine then added: “I went to Christmas parties.
“I took the kids to Lapland. I went to the Royal Hall for carolling. I did all of the Christmas stuff. I looked after a newborn baby.”
Katherine previously teased her surgery in December and told fans she was in “no pain” following the procedure.
“I went to York, it was three and a half hours, I elected to take the baby with me because she just turned eight weeks that day and I’m still breastfeeding her, obviously, I will be for a long time,” she told her fans.
“You can’t breastfeed immediately after surgery but I could obviously spend the night with her before and breastfeed her then.
“I was thinking to myself, after I got this surgery – which, wait until you see it, is pretty serious surgery – I was like, ‘Katherine Ryan what is your damage? What the f*** are you doing? Why have you brought a baby to surgery.’
“But then i thought, up and down this country, worldwide, everyday, we are giving women C-sections and then saying, ‘Sweet, go keep these twins alive’.”
Katherine clarified that a C section is “much more serious” than the procedure she had.
She joked: “So, what’s an elective cosmetic procedure with a newborn?”
She says there is more information coming soon on the show.
Katherine’s husband, Bobby Kootstra revealed in October that the comedian welcomed their newborn in just 45 minutes.
She appeared to have a speedy bounce back, as Bobby even shared a snap of the star enjoying a flute of prosecco in hospital following he birth,
Alongside baby Holland, Katherine and bobby share children Fenna, two, and three-year-old Fred.
The comedian is also a mum to 15-year-old Violet, who she has from a previous relationship.